I've noticed in 10.6 that when I use Exposé in Application Windows mode, it shows me all my windows, not just the ones in the current Space. I always end up clicking on the wrong window and being whisked away to a another Space. To stop that from happening, open Terminal and run these two commands:

10.6: Only show windows from current Space in Exposé
Authored by: Geobunny on Oct 16, '09 08:06:38AM

Fantastic. This will go some way to making 10.6 viable for me again. Now all we need to do is find out how to re-enable the old 10.3 - 10.5 exposé window placement algorithm and I can consider reinstalling 10.6. Went back to 10.5.8 weeks ago.

10.6: Only show windows from current Space in Exposé
Authored by: JPry on Oct 16, '09 08:29:51AM

I tried this on my Mac, but I wasn't able to get it to work. For instance, I minimized a Safari window in Space 1, then switched to Space 2 and activated Exposé via a hot corner. The minimized Safari window still shows up.

I double-checked spelling, and even opened up the actual .plist file to verify that it was written to the file correctly. I even tried restarting the system, instead of only killing the Dock.

I don't know if this is relevant, but I have the option enabled to only minimize windows behind their corresponding Dock icon, rather than having their own spot on the Dock.

10.6: Only show windows from current Space in Exposé
Authored by: asmeurer on Oct 16, '09 11:38:35AM

This annoyed me at first, but now I find myself taking advantage of it. It would be nice if there could be a way to do either one, depending on if I want to only see windows that I know are in the space I am in or if I want to see every window of an application.

Or even better, if it could still show every window from every space, but actually tell me which space a window is in. I have space switching disabled, so I usually have to go through each space to find a window in a program that isn't assigned to a specific space.

10.6: Only show windows from current Space in Exposé
Authored by: Michelasso on Oct 17, '09 07:26:29AM

I don't like it. Now when I click and hold in an application icon, if the app doesn't have any window in the current space it shows an empty background. I'm back to normal.

Instead what really annoys me is that when I select a window in another space (clicking and holding) it first goes back to the old (current?) space, and then it switches to that window changing space. Is there are parameter to change that behavior? It gets pretty confusing.

10.6: Only show windows from current Space in Exposé
Authored by: Rosanne on Jun 24, '10 07:19:29AM

It looks a bit buggy but I find it quite useful. If you use the above tip, then show all spaces F8, and go to the application expose, you'll actually get the windows from all spaces, but only the titles are shown for windows not in this space. You can use this to check whether there are any windows open for an application.

so: F9 gives only for one space
F8 and then F9 gives windows for all spaces